Concept: A joint stock company has perpetual existence because it is a separate legal entity.
Explanation: A joint stock company is a corporate entity with its own legal identity.
It is distinct from its shareholders or members.
Therefore, the company continues to exist even when members retire, transfer shares, or pass away.
The death, insolvency, or change of members does not affect the company's existence.
This feature is known as perpetual succession.
Thus, perpetual existence arises from the company being a corporate entity.
Answer: B. it is a corporate entity